cylinder staircase picture

Quick answer：

Cylinder staircases are a type of architectural feature where the treads and risers are shaped in a cylindrical form, creating a spiral design. They are often used in modern and minimalist architectural designs. The term 'cylinder staircase picture' refers to an image showcasing such a staircase. For more detailed information, one could look into architectural design, structural engineering, and the history of staircase design.